/runner/_work/cobalt/cobalt/./src/.github/actions/build/action.yaml (Line: 54, Col: 13): Unexpected symbol: '"null"'. Located at position 28 within expression: inputs.test_root_target != "null"

GitHub.DistributedTask.ObjectTemplating.TemplateValidationException: The template is not valid. /runner/_work/cobalt/cobalt/./src/.github/actions/build/action.yaml (Line: 54, Col: 13): Unexpected symbol: '"null"'. Located at position 28 within expression: inputs.test_root_target != "null" at GitHub.DistributedTask.ObjectTemplating.TemplateValidationErrors.Check() at GitHub.Runner.Worker.ActionManifestManager.ConvertRuns(IExecutionContext executionContext, TemplateContext templateContext, TemplateToken inputsToken, String fileRelativePath, MappingToken outputs) at GitHub.Runner.Worker.ActionManifestManager.Load(IExecutionContext executionContext, String manifestFile)